/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.k8s.discovery;

import io.kubernetes.client.extended.leaderelection.LeaderElector;

/**
 * Interface to abstract creation/use of {@link LeaderElector} from k8s-client java lib to allow unit tests with
 * mock impl.
 */
public interface K8sLeaderElectorFactory
{
  K8sLeaderElector create(
      String candidateId,
      String namespace,
      String lockResourceName
  );
}

interface K8sLeaderElector
{
  String getCurrentLeader();
  void run(Runnable startLeadingHook, Runnable stopLeadingHook);
}
